Your Bekker is geographically very near if your Holsen is near Bunde, Hüllhorst or Minden. I only researched direct-line ancestors, and only know of my Johann Heinrich Bekker's descendants through his son Johann Friedrich Bekker who was called Meiße. J.F. married a Meiße farm and used Meiße as his surname. As you keep tracing back one generation at a time, you may run into my Bekker line in neighboring Lippe Detmold.
You might try this Website:http://freepages.genealogy.rootsweb.com/~schnake
as Roy Johnson has a large database centered on that region.